Film spool for photographic cameras



Nov. 22, 1938. H. NERWIN 2,137,502

FILM SPOOL FOR PHOTOGRAPHIG CAMERAS Filed Oct. 8, 1937 Mum/0r: flier? Mill/[:72

Patented Nov. 22, 1938 UNITED STATES PATENT .OFFICE' FILM SPOOL FOR PHOTOGRAPH) CAM- ERAS - Hubert Nerwin, Dreaden-Seidnitz, Germany, asaignor to Zeiaa Ikon Aktiengeaelllchatt, Dreadcn, Germany Application October a, 1937, Serial No. 168,085 In Germany October *6, 1938 I 6 Claims; (Cl. 242-74) This invention relates to improvements in film Fig. 2 is partly front elevation and partly secspools for photographic cameras. tion, and

It is an object of the invention to provide a film Fig. 3 is a sectional view on line 3-3 of Fig. 2. spool into which the end of the film or leader at- The film spool comprises a body i made of suit- 5 tached thereto may be more readily inserted than able material and having flanges 2 and 3 which 5 in the film spools in use at the present time. are spaced from each other a distance corre- Most of the film spools in use are provided sponding approximately to the width oi. the film, with a body of cylindrical shape having a transnot shown in the drawing. This film spool may verse slit in a plane parallel to the axis of the have at one end an extension 4 with a coupling body. The insertion of the end of the fihn into socket 5 for the driving mechanism (not shown) this slit had been difiicult, particularly in the and may be provided at the other end with a dark-room, and it had been customary to trim socket 6 in which a key for positioning the film down the end of the film to make the insertion spool may be located. somewhat easier. This reduction of the film in The main portion or the body -I is spaced from width obviously could be carried out solely by a tongues which extends from one end of the 15 sacrificing a portion of the film which otherwise body to a point short of the opposite end, thereby would have been available for pictures. The loss leaving between the main portion of the body I is especially noticeable in films for miniature and the tongue 8, a slit]. As shown in the drawcameras as they have become very popular reing this slit is inclined somewhat to the axis of cently. This reduction of the film in width by the body to make it easier to push the film into scissors or the like also had to be carried out in the slit transversely to the film.

the dark-room, and hence also was an operation Owing to this arrangement the film does not which the average camera user could not perhave to be threaded transverselythrough the body form very readily. Y but may be inserted substantially longitudinally 5 The present invention has the object of elimiof the body from the open end of the slit 1 so hating the necessity of trimming the end and of as to project from opposite sides of the same, threading the film through a transverse slit. whereupon by rotation of the body, the film may The object of the invention may be described be firmly wound thereon in the ordinary way. as providing aholding tongue equidistantly spaced This insertion substantially longitudinally of the from the main portion of thefilm body, but body may be carried out in complete darkness 30 shorter than the latter, to permit insertion of much more easily than the threading operation the film transversely to its length into the interinvolving the passage of the end of the film or space. leader transversely through the body.

The invention also has the object of providing An additional means may be provided in the a film spool withabody having aslit which opens interior of the slit for holding the film end in 3 longitudinally of the body at one end, permitting position. Many films in use at the present time, thereby at the open end the insertion of the film especially films for miniature cameras, are protransversely to the length of the film. vided with marginal rows of sprocket holes. At

Another object of the invention is to facilitate least, one of the walls of the slit 1 is shown to 40 the insertion of the film by providing a slit which have a projecting lug 9 of a size to engage a 40 in its entirety extends at a slight angle to the sprocket hole of the film, not shown, whereby axis of the spool body and opens into the cirthe film is adapted to lock itself in position against cumference of the body along an uninterrupted longitudinal movement in either direction. line extending from one end of the slit to the The arrangement of this slit does not require other. a a reduction of the ends of the film for insertion. 45

It is, furthermore, an object of the invention The user also avoids the risk of inserting the film to provide a spool for perforated films in which at an angle to its longitudinal axis-a danger the slit itself is equipped with means for locking which was present whenever a reduced portion the film in position. of the film was threaded in darkness through a With these and numerous other objects in view, transverse slit. 50 an embodiment of the invention is illustrated in In Fig. 3 this slit 1 is shown as extending along the accompanying drawing to which reference is an arcuate line through the body I of the spool. made in the following specification. This is of advantage, but it is obvious that this In the drawing: transverse curvature of the slit is not essential.

Fig. 1 is a side elevation ofthe film spool; The arrangement of a tongue extending in spaced 55 relation from one end oi the body to a point remote from the other end. will provide a slit into which the fllm may very easily be pushed in a direction longitudinal to the axis of the body.

while the drawing shows and the specification describes a preferred embodiment of this invention, the latter is not to be limited to any 01' the details shown herein, and many other modiflcations may suggest themselves as being within the scope of the appended claims.

I claim:

1. A fllm spool having a body provided with axially spacedvflanges and a slit for the insertion or the fllm, said slit extending at an angle to the axis of rotation 01' the body, starting at the circumference 01' said body between said flanges and terminating at one oi said flanges, and means extending into said slit adjacent said last named flange for engaging a hole oi the fllm inserted in said slit.

2. A fllm spool having a body provided with axially spaced flanges and a sIit-ior-the insertion of the fllm, said slit extending at an angle to the axis of rotation of the body without intersecting said axis of rotation, starting at the circumi'erence of said body between said flanges and terminating at one of said flanges, and means extending into said slit adjacent said last named flange for engaging a hole of the fllm inserted in said slit.

3. A fllm spool having a cylindrical body provided with axially spaced annular flanges and a slit for the insertion of the fllm,-said slit extending at a slight angle to the axis of rotation of the spool and being arranged completely on one side of said axis, starting at the circumference or the body between said flanges and terminating at one of said flanges, and a projection extending into said slit at a right angle to the axis of said body and adjacent said last named flange for engaging a hole of the fllm inserted in said slit.

4. A fllm spool having a cylindrical body provided with axially spaced annular flanges and a slit iorthe insertion of the fllm, said slit extending at a slight angle to the axis oi rotation of the spool and being arranged completely on one side of said axis, starting at the circumference of the body between said flanges and terminating at one 01' said flanges. was to form from a portion of said cylindrical body a tongue-shaped member supported by one oi. said flanges and separated from the other portion 01' said cylindrical body by said slit, and a projection extending from said tongue-shaped member adjacent its supporting flange into said slit for engaging a hole of the fllm inserted in said slit.

5. A fllm spool having a cylindricalbody proseparated from the other portion of said cy1in-- drical body by said slit, and a projection extending from said tongue-shaped member adjacent its supporting flange into said slit but remaining spaced from the opposite portion of said cylindrical body for engaging a hole 0! the fllm inserted in said slit.

6. A fllm spool having a cylindrical body providedwith axially spaced annular flanges and a slit tor the insertion oi the fllm, said slit extending at a slight angle to the axis of rotation of the spool and being arranged completely on one side 01' said axis, starting at the circumference of the body between said flanges and terminating at one or said flanges, so as to form from a portion of said cylindrical body a tongueshaped member, and a projection on the inner face 01' said tongue-shaped member adjacent said last named flange for engaging a hole of the fllm inserted in said slit.

HUBERT NERWIN. 

